The 9th IAS Conference on HIV Science released in Paris a study showing that no HIV-positive man with an undetectable viral load was able to transmit the virus to his partner.
About 358 gay couples from Brazil, Thailand and Australia participated in the study, which took place between the years 2012 and 2016. All of them totaled 17,000 anal intercourse without a condom in the period.
In the research, all couples were serodiscordant (how much one has HIV, and another does not). Those who had the virus had an undetectable viral load, meaning HIV did not appear in the blood. This happens when all the medication is being taken properly.
The research results show that HIV treatment blocks transmission in couples with different levels of the disease. However, it is necessary for the virus carrier to be under regular medical care, and especially not to lose any of the antiretroviral medications, so that the viral load remains undetectable.